Know Your Environment. Protect Your Health.

Arsenic

Tesoro Viejo Master Mwc, Inc.

Arsenic is a potent carcinogen and common contaminant in drinking water. Arsenic causes thousands of cases of cancer each year in the U.S. Click here to read more about arsenic.

 

29

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.900 ppb31ND - 2.70 ppb
2019ND30ND
2020ND110ND
20210.575 ppb41ND - 2.30 ppb
20220.700 ppb31ND - 2.10 ppb
20230.400 ppb51ND - 2.00 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.004 ppb

The EWG Health Guideline of 0.004 ppb for arsenic was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL): 10 ppb

The legal limit for arsenic, established in 2001, was based on costs for arsenic removal, as calculated at the time that the standard was set. This limit does not fully protect against the risk of cancer due to arsenic exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2018-08-15CA2010017_002_002-201808151055ND
2018-12-06CA2010017_006_006-201812061040ND
2018-12-12CA2010017_001_001-2018121210452.70 ppb
2019-05-15CA2010017_001_001-201905151345ND
2019-06-12CA2010017_006_006-201906121015ND
2019-08-21CA2010017_002_002-201908210955ND
2020-02-05CA2010017_006_006-202002051000ND
2020-02-19CA2010017_006_006-202002190915ND
2020-03-03CA2010017_006_006-202003031015ND
2020-03-03CA2010017_003_003-202003031020ND
2020-03-04CA2010017_006_006-202003041000ND
2020-03-04CA2010017_003_003-202003041030ND
2020-03-05CA2010017_003_003-202003051025ND
2020-03-05CA2010017_006_006-202003051020ND
2020-06-03CA2010017_002_002-202006031215ND
2020-06-09CA2010017_001_001-202006090845ND
2020-06-15CA2010017_002_002-202006151100ND
2021-02-03CA2010017_006_006-202102031045ND
2021-02-17CA2010017_006_006-202102171035ND
2021-06-09CA2010017_001_001-202106090845ND
2021-06-28CA2010017_002_002-2021062809552.30 ppb
2022-02-16CA2010017_006_006-2022021609202.10 ppb
2022-06-08CA2010017_001_001-202206080930ND
2022-07-06CA2010017_002_002-202207060900ND
2023-02-13CA2010017_002_002-202302130630ND
2023-02-14CA2010017_006_006-202302141040ND
2023-02-14CA2010017_006_006-2023021410402.00 ppb
2023-06-05CA2010017_001_001-202306051040ND
2023-06-20CA2010017_001_001-202306200755ND